#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void CreateInitFile(const char *libName, FILE *fout)
{
  const char *prefix = "";
  const char* dllexp = "VTK_ABI_EXPORT ";

  fprintf(fout,"// Generated by vtkWrapPythonInit in VTK/Wrapping\n");
  fprintf(fout,"#include \"vtkPython.h\"\n");
  fprintf(fout,"#include \"vtkPythonCompatibility.h\"\n");
  fprintf(fout,"#include \"vtkSystemIncludes.h\"\n");
  fprintf(fout,"// Handle compiler warning messages, etc.\n"
          "#if defined( _MSC_VER ) && !defined(VTK_DISPLAY_WIN32_WARNINGS)\n"
          "#pragma warning ( disable : 4706 )\n"
          "#endif // Windows Warnings\n\n");

  fprintf(fout,"extern \"C\" { PyObject *real_init%s(const char *); }\n\n", libName);

  fprintf(fout,"#ifdef VTK_PY3K\n");

  fprintf(fout,"extern  \"C\" { %sPyObject *PyInit_%s%s(); }\n\n", dllexp, prefix, libName);

  fprintf(fout,"PyObject *PyInit_%s()\n", libName);
  fprintf(fout,"{\n");
  fprintf(fout,"  return real_init%s(nullptr);\n", libName);
  fprintf(fout,"}\n");

  fprintf(fout,"#else\n");

  fprintf(fout,"extern  \"C\" { %svoid init%s%s(); }\n\n", dllexp, prefix, libName);

  fprintf(fout,"void init%s()\n", libName);
  fprintf(fout,"{\n");
  fprintf(fout,"  real_init%s(nullptr);\n", libName);
  fprintf(fout,"}\n");

  fprintf(fout,"#endif\n");
}


/* warning this code is also in getclasses.cxx under pcmaker */
/* this routine creates the init file */
static void CreateImplFile(const char *libName,
  int numFiles, char **files,
  FILE *fout)
{
  int i;

  const char* dllexp = "VTK_ABI_EXPORT ";

  fprintf(fout,"// Generated by vtkWrapPythonInit in VTK/Wrapping\n");
  fprintf(fout,"#include \"vtkPython.h\"\n");
  fprintf(fout,"#include \"vtkPythonCompatibility.h\"\n");
  fprintf(fout,"#include \"vtkSystemIncludes.h\"\n");
  fprintf(fout,"#include <string.h>\n");
  fprintf(fout,"// Handle compiler warning messages, etc.\n"
          "#if defined( _MSC_VER ) && !defined(VTK_DISPLAY_WIN32_WARNINGS)\n"
          "#pragma warning ( disable : 4706 )\n"
          "#endif // Windows Warnings\n\n");

  for (i = 0; i < numFiles; i++)
  {
    fprintf(fout,"extern  \"C\" {%sPyObject *PyVTKAddFile_%s(PyObject *); }\n", dllexp, files[i]);
  }

  fprintf(fout,"\nstatic PyMethodDef Py%s_Methods[] = {\n", libName);
  fprintf(fout,"{nullptr, nullptr, 0, nullptr}};\n\n");

  fprintf(fout,"#ifdef VTK_PY3K\n");
  fprintf(fout,"static PyModuleDef Py%s_Module = {\n", libName);
  fprintf(fout,"  PyModuleDef_HEAD_INIT,\n");
  fprintf(fout,"  \"%s\", // m_name\n", libName);
  fprintf(fout,"  nullptr, // m_doc\n");
  fprintf(fout,"  0, // m_size\n");
  fprintf(fout,"  Py%s_Methods, //m_methods\n", libName);
  fprintf(fout,"  nullptr, // m_reload\n");
  fprintf(fout,"  nullptr, // m_traverse\n");
  fprintf(fout,"  nullptr, // m_clear\n");
  fprintf(fout,"  nullptr  // m_free\n");
  fprintf(fout,"};\n");
  fprintf(fout,"#endif\n\n");

  fprintf(fout,"extern  \"C\" {%sPyObject *real_init%s(const char *); }\n\n", dllexp, libName);

  fprintf(fout,"PyObject *real_init%s(const char *)\n{\n", libName);

  /* module init function */
  fprintf(fout,"#ifdef VTK_PY3K\n");
  fprintf(fout,"  PyObject *m = PyModule_Create(&Py%s_Module);\n",
               libName);
  fprintf(fout,"#else\n\n");
  fprintf(fout,"  PyObject *m = Py_InitModule(\"%s\",\n"
               "                              Py%s_Methods);\n",
          libName, libName);
  fprintf(fout,"#endif\n\n");

  fprintf(fout,"  PyObject *d = PyModule_GetDict(m);\n");
  fprintf(fout,"  if (!d)\n");
  fprintf(fout,"  {\n");
  fprintf(fout,"    Py_FatalError(\"can't get dictionary for module %s\");\n",
    libName);
  fprintf(fout,"  }\n");

  for (i = 0; i < numFiles; i++)
  {
    fprintf(fout,"  PyVTKAddFile_%s(d);\n",
      files[i]);
  }

  fprintf(fout,"\n");
  fprintf(fout,"  return m;\n");
  fprintf(fout,"}\n\n");
}


int main(int argc,char *argv[])
{
  FILE *file;
  FILE *fout_init;
  FILE *fout_impl;
  int numFiles = 0;
  char libName[250];
  char tmpVal[250];
  char *files[4000];

  if (argc < 4)
  {
    fprintf(stderr,"Usage: %s input_file init_file impl_file\n",argv[0]);
    return 1;
  }

  file = fopen(argv[1],"r");
  if (!file)
  {
    fprintf(stderr,"Input file %s could not be opened\n",argv[1]);
    return 1;
  }

  /* read the info from the file */
  if (fscanf(file,"%s",libName) != 1)
  {
    fprintf(stderr,"Error getting libName\n");
    fclose(file);
    return 1;
  }
  /* read in the classes */
  while (fscanf(file,"%s",tmpVal) != EOF)
  {
    files[numFiles] = strdup(tmpVal);
    numFiles++;
  }
  /* close the file */
  fclose(file);
  file = NULL;

  fout_init = fopen(argv[2],"w");
  if (!fout_init)
  {
    return 1;
  }

  fout_impl = fopen(argv[3],"w");
  if (!fout_impl)
  {
    fclose(fout_init);
    return 1;
  }

  /* extra functions, types, etc. for the CommonCore module */
  if (strcmp(libName, "vtkCommonCorePython") == 0 ||
    strcmp(libName, "vtkCommonKitPython") == 0)
  {
    files[numFiles] = strdup("PyVTKExtras");
    numFiles++;
  }

  CreateInitFile(libName, fout_init);
  CreateImplFile(libName, numFiles, files, fout_impl);
  fclose(fout_init);
  fclose(fout_impl);

  return 0;
}